Sewing machine

Patent metadata

Field	Value
Publication number	US-11098424-B2
Application number	US-201916506860-A
Country	US
Kind code	B2
Filing date	Jul 9, 2019
Priority date	Aug 9, 2018
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

A sewing machine includes: a presser spring depressing a presser bar; a presser main body fixed thereto, including a presser; a lower feed dog protruding further upward than a needle plate, to feed a sewing target rearward; an upper feed mechanism above the lower feed dog, that includes an upper feed dog behind a needle location and feeds the sewing target rearward via the upper and lower feed dogs; and a spring presser release mechanism relatively movably mounted on the presser bar, including a transmission member transmitting presser spring force to the presser bar, and operating when the lower contacts the upper feed dog, lifting the transmission member relative to the presser bar, to release the force applied thereto. The movement of the transmission member with respect to the presser bar during spring presser release mechanism operation matches a movement of the lower feed dog protruding from the needle plate.

First claim

What is claimed is:

1. A sewing machine comprising:
a needle plate;
a presser bar;
a presser spring configured to apply a force to the presser bar toward a lower side;
a presser main body fixed to the presser bar, and comprising a presser that presses a sewing target;
a lower feed dog arranged below the presser, and configured to protrude upward from the needle plate, and to feed the sewing target toward a rear side;
an upper feed mechanism arranged above the lower feed dog, comprising an upper feed dog, wherein an entire body of the upper feed dog is arranged behind a needle location point, toward the rear side, such that the upper feed mechanism is configured to be operated so as to feed the sewing target toward the rear side by the upper feed dog and the lower feed dog;
a feed driving unit configured to drive the upper feed dog such that the upper feed dog performs an upper feeding operation; and
a spring presser release mechanism mounted on the presser bar and configured to be moved relatively to the presser bar, and comprising a transmission member that transmits the force applied by the presser spring to the presser bar,
wherein, when the lower feed dog comes in contact with the upper feed dog, the spring presser release mechanism controls the transmission member to move upwards with respect to the presser bar, so as to release the force applied to the presser bar;
wherein the spring presser release mechanism makes the transmission member move up and down within a distance with respect to the presser bar, the distance being the same as a protrusion height of the lower feed dog that protrudes upward from the needle plate; and
wherein, when the transmission member is at a highest position within the distance, a bottom of the presser and a top of the lower feed dog are positioned at a same height position as one another.

2. The sewing machine according to claim 1 , wherein the upper feed mechanism is coupled to the presser main body such that the upper feed mechanism and the presser main body are configured as a unit,
wherein the upper feed mechanism comprises a feed coupling portion detachably coupled to the feed driving unit,
and wherein the presser main body comprises a presser fixing portion detachably fixed to the presser bar.

Assignees

• Janome Sewing Machine Co Ltd

Inventors

• Azuma Toyohiro

Classifications

• D05B29/00 Primary

  Pressers; Presser feet (for feeding D05B27/04) · CPC title

• D05B27/06 Primary

  arranged above and below the workpieces · CPC title